但是它还有一种写法:a[::-1],输出的结果是和当前的结果相反。在某些情况下,它的应用还是比较有意思的。就想针对这一块总结一下。 slice在python中的应用 在python中,list, tuple以及字符串等可以遍历访问的类型都可以应用slice访问。slice本身的意思是指切片,在这些可以遍历访问的类型中截取其中的某些部分。比如如...
python的slice函数 python的slice函数 在Python中，切片(slice)是一种非常有用的操作，可以用来从字符串、列表、元组等序列类型的对象中提取部分子序列。切片的写法为[起始位置:终止位置:步长]，其中起始位置可以省略，默认为0，终止位置可以省略，默认为序列的长度，步长可以省略，默认为1 下面我们将详细讨论切片函数的...
2. What is Slice Notation in Python? Slice notation is a syntax feature in Python that allows you to extract a specific subset of a sequence. You can use slice notation with any sequence in Python, including strings, lists, and tuples. Slice notation returns a new sequence that is a sub...
# 每隔一个元素取值 slice4 = my_list[::2] # [0, 2, 4, 6, 8] print(slice4) # 反向切片 slice5 = my_list[::-1] # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0] print(slice5) # 指定起始点和步长 slice6 = my_list[1:9:3] # [1, 4, 7] print(slice6) 1. 2. 3. 4. 5...
1. slice slice的基本语法格式如下: slice(start, stop, step) •start:切片的起始位置,表示从序列的哪个索引开始切片(包含该索引对应的元素)。 •stop:切片的结束位置,表示切片的最后一个元素的索引值(不包含该索引对应的元素)。 •step:切片的步长,表示每次跳过多少个元素进行切片,可以是负数。 下面是一个...
Although, we wouldn’t typically do this in a Python program,for us to really see the content of that range object,so what we can do in this case is we can turn it into a list. 所以如果我们说“范围5列表”,我们会看到范围对象由五个数字组成,从0到4。 So if we say "list of range ...
Slicing won’t be useful for this, as strings areimmutabledata types, in terms of Python, which means that they can’t be modified. What we can do is create a new string based on the old one: We’re not changing the underlying string that was assigned to it before. We’re assigning...
b = a # Point b at what a is pointing to b is a # => True, a and b refer to the same object b == a # => True, a's and b's objects are equal b = [1, 2, 3, 4] # Point b at a new list, [1, 2, 3, 4] ...
A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: pandas.pydata.org/panda self.obj[item_labels[indexer[info_axis]]] = value 2.出现警告的原因 一开始的时候点进提示中的官网...
What is the difference between lists and tuples in Python?Show/Hide When would you prefer tuples over lists?Show/Hide How do you create a list from a tuple in Python?Show/Hide What's the point of a tuple?Show/Hide Are tuples immutable?Show/Hide Mark...